package com.jack.collections;

import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * java.util.ConcurrentModificationException
 *
 **/
public class unsafeList {

    public static void main(String[] args) {
        List<String> list = new CopyOnWriteArrayList<>();
//                Collections.synchronizedList(new ArrayList<>());
//                new Vector();
//                new ArrayList<>();
//
        for (int i = 0; i < 30; i++) {
            new Thread(() ->{
                list.add(UUID.randomUUID().toString().substring(0,8));
                System.out.println(list);
                },String.valueOf(i)).start();
        }
    }
}
